Archenteron is formed during

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(C) The $Archenteron$ is the primitive gut cavity that forms during the process of $Gastrulation$. $Gastrulation$ is the phase in embryonic developmen

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Early gastrula

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(C) The $Archenteron$ is the primitive gut cavity that forms during the process of $Gastrulation$. $Gastrulation$ is the phase in embryonic development where the single-layered $Blastula$ is reorganized into a multi-layered structure called the $Gastrula$. During the early stages of $Gastrulation$,cells migrate inward to form the primary germ layers,and this inward movement creates a cavity known as the $Archenteron$ or primitive gut. Therefore,the $Archenteron$ is formed during the early gastrula stage.

Column $I$	Column $II$
$a$. Fully formed morula	$i$. By end of $7^{\text{th}}$ day after fertilization
$b$. Fully formed blastocyst	$ii$. $15$ days after fertilization
$c$. Completion of implantation process	$iii$. By end of $4^{\text{th}}$ day after fertilization
$d$. Fully formed gastrula	$iv$. By end of $10^{\text{th}}$ day after fertilization

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